Golang GCECloud.DetachDisk方法代码示例

// Detaches the specified persistent disk device from node, verifies that it is detached, and retries if it fails.
// This function is intended to be called asynchronously as a go routine.
func detachDiskAndVerify(c *gcePersistentDiskCleaner) {
	glog.V(5).Infof("detachDiskAndVerify(...) for pd %q. Will block for pending operations", c.pdName)
	defer util.HandleCrash()

	// Block execution until any pending attach/detach operations for this PD have completed
	attachDetachMutex.LockKey(c.pdName)
	defer attachDetachMutex.UnlockKey(c.pdName)

	glog.V(5).Infof("detachDiskAndVerify(...) for pd %q. Awake and ready to execute.", c.pdName)

	devicePaths := getDiskByIdPaths(c.gcePersistentDisk)
	var gceCloud *gcecloud.GCECloud
	for numRetries := 0; numRetries < maxRetries; numRetries++ {
		var err error
		if gceCloud == nil {
			gceCloud, err = getCloudProvider()
			if err != nil || gceCloud == nil {
				// Retry on error. See issue #11321
				glog.Errorf("Error getting GCECloudProvider while detaching PD %q: %v", c.pdName, err)
				time.Sleep(errorSleepDuration)
				continue
			}
		}

		if numRetries > 0 {
			glog.Warningf("Retrying detach for GCE PD %q (retry count=%v).", c.pdName, numRetries)
		}

		if err := gceCloud.DetachDisk(c.pdName, c.plugin.host.GetHostName()); err != nil {
			glog.Errorf("Error detaching PD %q: %v", c.pdName, err)
			time.Sleep(errorSleepDuration)
			continue
		}

		for numChecks := 0; numChecks < maxChecks; numChecks++ {
			allPathsRemoved, err := verifyAllPathsRemoved(devicePaths)
			if err != nil {
				// Log error, if any, and continue checking periodically.
				glog.Errorf("Error verifying GCE PD (%q) is detached: %v", c.pdName, err)
			} else if allPathsRemoved {
				// All paths to the PD have been succefully removed
				unmountPDAndRemoveGlobalPath(c)
				glog.Infof("Successfully detached GCE PD %q.", c.pdName)
				return
			}

			// Sleep then check again
			glog.V(3).Infof("Waiting for GCE PD %q to detach.", c.pdName)
			time.Sleep(checkSleepDuration)
		}

	}

	glog.Errorf("Failed to detach GCE PD %q. One or more mount paths was not removed.", c.pdName)
}

// Detaches the specified persistent disk device from node, verifies that it is detached, and retries if it fails.
// This function is intended to be called asynchronously as a go routine.
// It starts the detachCleanupManager with the specified pdName so that callers can wait for completion.
func detachDiskAndVerify(c *gcePersistentDiskCleaner) {
	glog.V(5).Infof("detachDiskAndVerify for pd %q.", c.pdName)
	defer util.HandleCrash()

	// Start operation, so that other threads can wait on this detach operation.
	// Set bufferSize to 0 so senders are blocked on send until we receive.
	ch, err := detachCleanupManager.Start(c.pdName, 0 /* bufferSize */)
	if err != nil {
		glog.Errorf("Error adding %q to detachCleanupManager: %v", c.pdName, err)
		return
	}

	defer detachCleanupManager.Close(c.pdName)

	defer func() {
		// Unblock any callers that have been waiting for this detach routine to complete.
		for {
			select {
			case <-ch:
				glog.V(5).Infof("detachDiskAndVerify for pd %q clearing chan.", c.pdName)
			default:
				glog.V(5).Infof("detachDiskAndVerify for pd %q done clearing chans.", c.pdName)
				return
			}
		}
	}()

	devicePaths := getDiskByIdPaths(c.gcePersistentDisk)
	var gceCloud *gce_cloud.GCECloud
	for numRetries := 0; numRetries < maxRetries; numRetries++ {
		var err error
		if gceCloud == nil {
			gceCloud, err = getCloudProvider()
			if err != nil || gceCloud == nil {
				// Retry on error. See issue #11321
				glog.Errorf("Error getting GCECloudProvider while detaching PD %q: %v", c.pdName, err)
				time.Sleep(errorSleepDuration)
				continue
			}
		}

		if numRetries > 0 {
			glog.Warningf("Timed out waiting for GCE PD %q to detach. Retrying detach.", c.pdName)
		}

		if err := gceCloud.DetachDisk(c.pdName); err != nil {
			// Retry on error. See issue #11321. Continue and verify if disk is detached, because a
			// previous detach operation may still succeed.
			glog.Errorf("Error detaching PD %q: %v", c.pdName, err)
		}

		for numChecks := 0; numChecks < maxChecks; numChecks++ {
			allPathsRemoved, err := verifyAllPathsRemoved(devicePaths)
			if err != nil {
				// Log error, if any, and continue checking periodically.
				glog.Errorf("Error verifying GCE PD (%q) is detached: %v", c.pdName, err)
			} else if allPathsRemoved {
				// All paths to the PD have been succefully removed
				glog.Infof("Successfully detached GCE PD %q.", c.pdName)
				return
			}

			// Sleep then check again
			glog.V(3).Infof("Waiting for GCE PD %q to detach.", c.pdName)
			time.Sleep(checkSleepDuration)
		}

	}

	glog.Errorf("Failed to detach GCE PD %q. One or more mount paths was not removed.", c.pdName)
}